A brake consisting essentially of the following: a. A single piece or divided cylinder housing designed to be mounted on the torque flange of an axle. The cylinder housing has a slot or groove through which the DISK, BRAKE passes. It contains a piston(s) or push rod(s) which provides the hydraulic or mechanical force to press the LINING, FRICTION against the DISK, BRAKE. b. LINING, FRICTION. c. A DISK, BRAKE designed to be keyed or rigidly attached to a wheel or rotating shaft.